This article analyzes data generated by the combined use of keylogging and eye tracking to examine grammatical (de)metaphorization as a case of explicitation/implicitation. It also aims at investigating effortful text production from the perspective of automaticity and monitoring in the translation process. Brazilian and German physicists and professional translators were recruited to translate one of two versions of an English (L2) source text into Brazilian Portuguese or German, respectively (L1). The versions differed in the level of grammatical metaphoricity of the sentences. Quantitative and qualitative data was analyzed to determine the impact of metaphoricity level on target text renditions as evidence of effort in the translation process. Results showed that regardless of which of the two versions was translated, most subjects opted for a particular wording from the start of their text production process; subsequent changes had to do with attempting more delicate choices in lexis rather than in grammar, evidence in favor of Tirkkonen-Condit’s claims about automatism in the translation process. Variables used to measure effort (i.e., number of renditions in microunits, pause duration, and drafting time) indicated that (de)metaphorization is an effortful procedure. Eye tracking, eliciting more fine-grained data, was instrumental in mapping instances of grammatical (de)metaphorization. The results have implications for issues related to the development of professional competence in translation, suggesting that instances of grammatical (de)metaphorization relate to higher levels of monitoring.